Concrete dam anti-seepage structure

Abstract

The utility model relates to the technical field of hydropower station engineering, and discloses a concrete dam anti-seepage structure which comprises a concrete dam body, a caulking plugging structure is arranged in a leakage seam on the upstream side of the concrete dam body, and the caulking plugging structure comprises a water stop reinforcing steel bar and a grouting plugging layer which are sequentially arranged in the leakage seam from inside to outside. The outer surfaces of the water-stop steel bars are coated with water-stop batts; a groove body is arranged on the downstream side of the concrete dam body, a pre-buried drainage pipe extending in the direction of the leakage seam is arranged in the groove body, a sealing layer and a water blocking layer are arranged between the outer side face of the pre-buried drainage pipe and the groove body from inside to outside, and the water blocking layer, the groove body and the pre-buried drainage pipe jointly define a cavity to form an anti-seepage filling layer through cement grouting. According to the upstream side leakage seam embedded seam plugging structure, after the embedded pipe is arranged through the chiseling groove in the downstream side for drainage, the sealing layer, the water blocking layer and the anti-seepage filling layer formed through grouting are arranged, the reliability of the anti-seepage structure is improved, and the structure is suitable for treatment of the leakage position where the water pressure of leakage water is large.

Description

Technical Field

[0001] The utility model relates to the technical field of hydropower station engineering, and particularly relates to a concrete dam anti-seepage structure. Background Art

[0002] A dam is a water retaining structure that intercepts the flow of rivers and channels to raise the water level or regulate the flow. Most dams are concrete dams. Due to the honeycomb and dog hole defects caused by the improper vibration compaction of concrete, under the action of long-term water pressure, the lifting and vibration of the gate and other factors, multiple changes form concentrated leakage channels, and in severe cases, water gushing and water jetting phenomena occur, affecting the safe operation and maintenance of the gate. Therefore, anti-seepage treatment is required. The existing conventional grouting plugging method is not applicable to the treatment of leakage sites with relatively high water pressure of seepage water. Content of the Utility Model

[0003] The purpose of the utility model is to provide a concrete dam anti-seepage structure to solve the problems in the background art.

[0004] To achieve the above purpose, the technical scheme adopted by the utility model is as follows: A concrete dam anti-seepage structure includes a concrete dam body. An embedded joint sealing structure is arranged in the leakage joint on the upstream side of the concrete dam body. The embedded joint sealing structure includes a water stop steel bar and a grouting plugging layer arranged in the leakage joint from inside to outside in sequence. The outer surface of the water stop steel bar is coated with a water stop cotton tire. A groove with a trapezoidal cross-section is arranged on the downstream side of the concrete dam body, and a pre-buried drainage pipe extending along the direction of the leakage joint is arranged in the groove. A sealing layer and a water blocking layer are arranged between the outer side surface of the pre-buried drainage pipe and the groove from inside to outside. The cavity formed by the water blocking layer, the groove and the pre-buried drainage pipe is filled with cement grouting to form an anti-seepage filling layer.

[0005] Preferably, the grouting plugging layer is filled and jointed with a cement water glass quick-setting grout.

[0006] Preferably, the thickness of the grouting plugging layer is 10 - 15 cm, and the surface of the grouting plugging layer is flush with the surface of the concrete dam body.

[0007] Preferably, the sealing layer is a water-absorbing and expanding rubber layer.

[0008] Preferably, the water blocking layer is formed by water-soluble polyurethane chemical grouting.

[0009] Preferably, the anti-seepage filling layer can be 3 - 4 cm higher than the surface of the concrete dam body.

[0010] Preferably, a reinforcing steel plate layer is arranged on the outer side surface of the anti-seepage filling layer, and the reinforcing steel plate layer is embedded into the anti-seepage layer through expansion steel nails.

[0011] Preferably, the surface of the pre-buried drain pipe is provided with an anti-corrosion galvanized layer, and the diameter of the pre-buried drain pipe is Ф20 mm.

[0012] Preferably, the depth of the trough body is 5 to 8 cm, and the inner width of the trough body is greater than the diameter of the pre-buried drainage pipe.

[0013] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0014] The new implementation method is to set a caulking sealing structure in the leakage seam on the upstream side, use the steel bar covered with cotton tire for preliminary sealing, and then fill the upstream side gap with a grouting sealing layer to achieve upstream side sealing, and then cut a groove on the downstream side, set a pre-buried steel pipe in the groove for drainage, set a sealing layer and a water-blocking layer between the pre-buried steel pipe and the groove from the outside to the inside, and finally fill with cement mortar for anti-seepage, which can have a good sealing and waterproofing effect, and can have a good anti-seepage effect on points with higher water pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a concrete dam anti-seepage structure of the utility model;

[0016] In the figure: 1-concrete dam body, 3-caulking sealing structure, 31-waterstop steel bar, 32-waterstop cotton tire, 33-grouting sealing layer, 4-trough body, 5-embedded drainage pipe, 6-sealing layer, 7-water-blocking layer, 8-anti-seepage filling layer, 9-reinforced steel plate layer. DETAILED DESCRIPTION

[0017] In order to make the technical personnel of the technical field better understand the present utility model scheme, the technical scheme in the present utility model embodiment will be clearly and completely described below in conjunction with the drawings in the present utility model embodiment. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by the technical personnel in the technical field belonging to the present utility model. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0018] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present utility model. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0019] As Figure 1 shown, a seepage prevention structure for a concrete dam includes a concrete dam body 1. An inlay sealing structure 3 is provided in the upstream leakage joint of the concrete dam body 1. The inlay sealing structure 3 includes a water-stop steel bar 31 and a grouting sealing layer 33 arranged in the leakage joint from the inside out. A water-stop cotton tire 32 is coated on the outer surface of the water-stop steel bar 31. A groove body 4 is arranged on the downstream side of the concrete dam body 1, and a pre-buried drainage pipe 5 extending along the direction of the leakage joint is arranged in the groove body 4. A sealing layer 6 and a water-blocking layer 7 are arranged between the outer side surface of the pre-buried drainage pipe 5 and the groove body 4 from the inside out. The water-blocking layer 7, the groove body 4, and the pre-buried drainage pipe 5 together enclose a cavity and form an anti-seepage filling layer 8 through cement grouting.

[0020] The grouting sealing layer 33 is formed by filling the joint with a cement-sodium silicate quick-setting grout. The cement-sodium silicate quick-setting grout is prepared by mixing cement slurry and sodium silicate. The volume ratio of the cement slurry to the sodium silicate is 1:1. It can quickly set underwater to form the grouting sealing layer 33.

[0021] The thickness of the grouting sealing layer 33 is 10 - 15 cm, and the surface of the grouting sealing layer 33 is flush with the surface of the concrete dam body 1.

[0022] The sealing layer 6 is a water-absorbing and expanding rubber layer. The water-absorbing and expanding rubber layer fills the gap by water absorption and expansion to achieve sealing and prevent leakage at the water-washing interface.

[0023] The water-blocking layer 7 is formed by water-soluble polyurethane chemical grouting. The chemical slurry ensures that the gap is filled with the chemical slurry to further block water. The chemical slurry binds tightly to the concrete, avoiding the subsequent formation of leakage points at the gap.

[0024] The anti-seepage filling layer 8 can be 3 - 4 cm higher than the surface of the concrete dam body 1. When the leakage point is severely honeycombed and cannot be deeply excavated and cleaned, the sealing material bulges outwards and thickens during sealing.

[0025] A reinforcing steel plate layer 9 is provided on the outer side surface of the anti-seepage filling layer 8. The reinforcing steel plate layer 9 is embedded in the anti-seepage layer through expansion steel nails. This structure is used to strengthen the anti-seepage layer structure.

[0026] The surface of the pre-buried drainage pipe 5 is provided with an anti-corrosion galvanized layer to improve the anti-corrosion performance of the pipe. The diameter of the pre-buried drainage pipe 5 is Ф20 mm.

[0027] In this embodiment, the depth of the groove body 4 is 5 - 8 cm, and the inner width of the groove body 4 is greater than the diameter of the pre-buried drainage pipe 5.

[0028] First, underwater plugging is carried out on the upstream side of the leakage point of the leakage joint. The water-stop steel bar 31 is used to wrap the water-stop cotton tire 32 and embed it into the leakage joint for preliminary plugging. A channel depth of 10 - 15 cm is reserved on the upstream side. The prepared cement-sodium silicate quick-setting grout is grouted and filled in the reserved joint until it is filled to form a grouting plugging layer 33, thus completing the caulking plugging structure 3 on the upstream side. The outer surface of the upstream side is flush with the surface of the concrete dam body 1 after plugging. After 2 - 3 days of completing the underwater plugging, if the water leakage volume at the water outlet of the leakage point decreases, the plugging of the downstream side of the leakage point is carried out. First, a groove is chiseled on the surface of the concrete dam body 1, and a groove body 4 with a trapezoidal cross-section is chiseled along the extension direction of the leakage joint. A pre-buried drainage pipe 5 is arranged in the groove body 4. A sealing layer 6 and a water-blocking layer 7 are arranged between the pre-buried drainage pipe 5 and the groove body 4 from the inside to the outside for sealing the joint. The sealing layer 6 uses a water-swellable rubber layer to absorb water and expand to fill the gap to prevent water leakage and improve the sealing effect. The water-blocking layer 7 is formed by water-soluble polyurethane chemical grouting to further block water. Then, the pre-buried drainage pipe 5 is cut off, and an anti-seepage filling layer 8 is formed by cement grouting to ensure the structural strength.

[0029] The above has generally described the present invention in detail. However, based on the present invention, some modifications or improvements can be made, which are obvious to those of ordinary skill in the art. Therefore, the modifications or improvements made without departing from the spirit and idea of the present invention are within the protection scope of the present invention.

Claims

1. A concrete dam anti-seepage structure, characterized in that: It comprises a concrete dam body, wherein a caulking sealing structure is arranged in the leakage joint on the upstream side of the concrete dam body, wherein the caulking sealing structure comprises water-stop steel bars and a grouting sealing layer which are arranged in the leakage joint from the inside to the outside in sequence, wherein the outer surface of the water-stop steel bars is covered with a water-stop cotton tire; a trough body with a trapezoidal cross-section is arranged on the downstream side of the concrete dam body, wherein a pre-buried drainage pipe extending along the leakage joint direction is arranged in the trough body, a sealing layer and a water-blocking layer are arranged between the outer side surface of the pre-buried drainage pipe and the trough body from the inside to the outside, wherein the water-blocking layer, the trough body and the pre-buried drainage pipe jointly form a cavity, through which a waterproof filling layer is formed by cement grouting.

2. The concrete dam anti-seepage structure according to claim 1, characterized in that: The grouting plugging layer is formed by grouting and filling the seams with cement water glass quick-setting slurry.

3. A concrete dam anti-seepage structure according to claim 2, characterized in that: The thickness of the grouting sealing layer is 10-15 cm, and the surface of the grouting sealing layer is flush with the surface of the concrete dam body.

4. The concrete dam anti-seepage structure according to claim 1, characterized in that: The sealing layer is a water-absorbing and swelling rubber layer.

5. The concrete dam anti-seepage structure according to claim 1, characterized in that: The water-blocking layer is formed by water-soluble polyurethane chemical grouting.

6. The concrete dam anti-seepage structure according to claim 1, characterized in that: The anti-seepage filling layer may be 3-4 cm higher than the surface of the concrete dam body.

7. The concrete dam anti-seepage structure according to claim 6, characterized in that: A reinforcing steel plate layer is provided on the outer side of the anti-seepage filling layer, and the reinforcing steel plate layer is embedded in the anti-seepage filling layer through expansion steel nails.

8. The concrete dam anti-seepage structure according to claim 1, characterized in that: The surface of the pre-buried drain pipe is provided with an anti-corrosion galvanized layer, and the diameter of the pre-buried drain pipe is Ф20mm.

9. The concrete dam anti-seepage structure according to claim 1, characterized in that: The depth of the trough body is 5 to 8 cm, and the inner width of the trough body is greater than the diameter of the pre-buried drainage pipe.

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